I'm having a problem here sorting some of this out.
So a lawyer walks into the SEC and mentions his clients trades are dubious re Cohen.
Harry markopolis walks into the SEC and mentions some of Madoff's trades don't add up. Nothing happens.
MF global money disappears. Nothing happens.
In the last two, people directly lost money. Re Cohen, insider trading just skims money off the top. I'm not saying insider trading is harmless just how are the decisions made on whom to prosecute in relation to harm done?